Globe-tester.



Patented-Sept. l0, l90l. H. ETHERIDGE.

GLOBE TESTER (Application fllgd May 9, 1901.)

(No Model.)

Ms 'A ttorn ey.

NITED STATES HARRY ETHERIDGE, OF MOKEESPORT, PENNSYLVANIA.

GLOBE-TESTER.

SPECIFICATION forming part of Letters Patent No. 682,183, datedSeptember 10, 1901.

Application filed May 9, 1901. Serial No. 59,377. (No model.)

To all whom, it may concern;

Be it known that I, HARRY ETHERIDGE, a subject of the King of GreatBritain, residing at McKeesport, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inGlobe- Testers; and I do hereby declare the following to be a full,clear, and exact description thereof, reference being had to theaccompanying drawings, which form a part of this specification.

This invention relates to new and useful improvements in globe-testers.

The invention particularly relates to testing inner globes as used forinclosing the carbons in arc-lights.

The object of my invention is to provide a simple, practical, andcomparatively inexpensive device by which the connections or joints ofthe globe, globe-holder, and carbonholder may be tested for air-leakage.

In the accompanying drawings I have illustrated a device by which myobject may be attained, in which- Figure 1 is a plan View of the testingdevice. Fig. 2 is a side elevation of the same, partly in section. Fig.3 is a side elevation of the device, on a reduced scale, showing thedevice in testing position upon a globe. Fig. 4: is an enlarged sideelevation of a portion of a globe and holder, being partly shown insection.

In said drawings the numeral 1 designates one of several forms of globesas used with arc-lamps.

The numeral 2 designates portions of the lamp-frame, having a base-piece3 thereon to engage a carbon etand said globe. Globes of this class areclamped within the base-piece to retain it in position and to excludeair, and the usual manner in which this is accomplished is to seat theglobe upon a pliable washer 5, which is fitted into a recess in the saidbase-piece. The outer periphery of this base-piece is threaded toreceive a collar 6. This collar carriesa contractible spiral spring 7,which engages the lip formed about the globe-base, thereby firmlysecuring or clamping said globe upon the pliable seat. Theabove-described lamp parts being old in the art are made use of in thiscase for the purpose of illustrating the use of mylamp-globe tester.

The lamp-globe-testing device consists of a weight or body 8, having astem 9 projecting from the top thereof and through which is formed anopening 10. To the said stem is attached a rubber hose 11, of suitablelength, terminating in a mouthpiece 12. The face of the weight or bodyis provided with an annular dovetailed groove 13, into which is fit tedor secured an elastic or yielding washer 14, which is preferably seatedat a depth beyond the surface of the Weight. After the globe and carbonare placed in position in the holder and made secure the device isplaced on top of said globe, as illustrated at Fig. 3, and in suchposition that the rubber washer 13 will engage the globe-top. Pressureis then applied through the mouthpiece into the globe. If the joints areall tight, the air will be compressed in the globe, indicating that thejoints are tight and in safe condition for use. If, however, acompression cannot be obtained, it is evident that a leak exists,requiring a new washer or globe, as the case may be. It is also evidentthat if compression is obtained a slight back pressure can be felt onthe tongue through the small orifice in the mouthpiece, which alsoindicates that the joints are perfect and in condition for use. It isalso evident that a vacuum condition may be formed by this same deviceby sucking the air out of the globe through the mouthpiece andindication of tight joints given with the well-known characteristics ofa vacuum condition and which will be made manifest by the tongue beingheld fast to the orifice in the mouthpiece.

The value of this invention is measured by the ability of thecarbon-setter to know when the globe-joints are tight, thus excludingair therefrom, and consequently increasing'the life of the lamp,practice proving that twenty per cent. additional life is obtained from.circuits in which this device is employed.

It is found in practice where this device is not in use that many lampsburn out much quicker than others, and upon examination it is found thatthe joints are imperfect, permitting air to enter the globes, andconsequently a greater consumption of carbon takes place in such lampsthan exists in lamps in which air is practically shut ofi.

The weight of this globe-tester is made to suit a safe tightness of thejoints in the globes, and which has been found in practice to be safeand convenient at or about five (5) pounds.

Modifications as to detail construction of this device may be madewithout departing from the principles involved.

Having thus fully shown and described my invention, what I claim as new,and desire to secure by Letters Patent, is-

1. A testing device for globes, comprising a detached body which by itsown weight is adapted to seal an open end of a globe upon which itfreely rests, and means whereby air may be conducted into or exhaustedfrom said globe through said body to detect leakage or fracture in saidglobe.

2. A testing device for globes, comprising a detached body which by itsown weight is adapted to seal an open end of a globe upon which itfreely rests, means whereby air may be conducted into or exhausted fromsaid globe through said body to detect leakage or fracture in saidglobe, and a yielding surface on said body where contact is made withthe said globe end.

8. A testing device for globes, comprising a detached body which by itsown weight is adapted to seal an open end of a globe upon which itrests, and an elastic conductor extending from said body whereby air maybe forced into or exhausted from said globe through said body to detectleakage or fracture therein.

4:. A testing device for globes, comprising a detached body which by itsown weight is adapted to seal an open end of a globe upon which itfreely rests, an elastic conductor extending from said body whereby airmay be forced into or exhausted from said globe through said body todetect leakage or fracture therein, and a yielding surface on said bodywhere contact isv made with the said globe end.

5. A testing device for globes, comprising a detached body which by itsown weight is adapted to seal an open end of a globe upon which itfreely rests, an elastic conductor extending from said body whichterminates in a mouthpiece whereby air may be forced into or exhaustedfrom said globe through said body to detect leakage or fracture therein,and a yielding surface on said body where contact is made with the saidglobe end.

